Question

There are 20 urns such that first urn
contains 5 balls the second contains
10 balls and in general the kth urn
contains 2k + 1 balls more than that in
(k - 13th urn. Then the total number of
balls in all the urns
(A) 3330
(B) 2890
(C) 2870
(D) 3311
w​

Answer 1

Answer:

Given

Sum of all balls

Total no of balls =20(21)(41)+20(21)+2(20)

=2870+420+40

=3330

∴ Option A is correct

hope so this will help you